محمدعلی شکرگزار
دانشیار، بانک سلولی ایران، انیستیتو پاستور ایران،
[ 1 ] - اثر کشش استاتیک بر جهت گیری سلول های مزانشیمال انسانی
کارکرد حیاتی سلول های بدن به بارهای مکانیکی که این سلول ها تجربه می کنند؛ وابسته است. سلول ها بسته به شرایط مکانیکی محیط مجاور خود ریخت و شکل ویژه ای دارند. در مهندسی بافت، دستیابی به سلول های هم ریخت و همسو در اغلب موارد مطلوب است و روش های گوناگون برای این کار پیشنهاد شده است. به عنوان مثال، سلول پس از بارگذاری دوره ای، باریک تر می شود و به صورت دسته های همسو با زاویه ای مشخص نسبت به محور کشش...
[ 2 ] - سنتز نقاط کوانتومی هسته/پوسته CdSe/ZnS و بررسی اثربخشی آنها در مرگ سلول های راجی در شرایط آزمایشگاهی
نقاط کوانتومی (نانوبلورهای نیمه هادی) و سیستم های هسته پوسته تهیه شده از آنها از جمله موادی هستند که امروزه بسیار مورد توجه قرار گرفته اند. از میان این دسته از مواد نقاط کوانتومی کادمیم سلناید (CdSe) به تنهایی و یا به همراه پوسته ای از سولفاید روی (ZnS)، به دلیل پایداری نوری، بازدهی لومینسانس بالا و دامنه وسیعی از بازتاب آن هم در محدوده نور مرئی، مورد توجه ویژه در برخی کاربردهای مهندسی پزشکی هس...
[ 3 ] - ساخت، مشخصه یابی و بررسی خواص مکانیکی و زیستی داربست هیبریدی نانوکامپوزیتی استخوانی از جنس آپاتیت/ ژلاتین- کیتوسان به روش زیست تقلیدی
In this project, we prepared biomimetic nanocomposite scaffolds from gelatin and chitosan and hydroxyapatite and subsequently the scaffolds were evaluated by common used bulk technique. For this purpose, the nanocomposite hydrogel/apatite bone tissue engineering scaffolds were fabricated using applied biomimetic method accompanied with freeze drying technique. The apatite was precipitated usi...
[ 4 ] - ساخت و بررسی زیست سازگاری غشاهای پلیمری بر پایه نانوکامپوزیت پلی هدرال الیگومریک سیلسسکویی اکسان (POSS) و پلی کربنات یورتان (PCU)
This study aims to characterize and evaluate the applicability of Polyhedral OligomericSilsesquioxane (POSS)/ Poly (carbonate-urea) Urethane (PCU) nanocomposite films as a temporary skin substitute by means of FTIR, MTT assay, cell proliferation assay and SEM studies. FTIR spectra showed all the characteristic peaks of POSS/PCU nanocomposite. The indirect cytotoxicity of membranes was investig...
[ 5 ] - Mesenchymal Stem Cells as an Alternative for Schwann Cells in Rat Spinal Cord Injury
Background: Spinal cord has a limited capacity to repair therefore, medical interventions are necessary for treatment of injuries. Transplantation of Schwann cells has shown a great promising result for spinal cord injury (SCI). However, harvesting Schwann cell has been limited due to donor morbidity and limited expansion capacity. Furthermore, accessible sources such as bone marrow stem cells ...
[ 6 ] - Functional Recombinant Extra Membrane Loop of Human CD20, an Alternative of the Full Length CD20 Antigen
Background: Targeting of CD20 antigen with monoclonal antibodies has become the mainstay in the treatment of non-Hodgkin's lymphomas and immunotherapeutic depletion of malignant B cells. Accessibility of antigen is one of the crucial factors in development of monoclonal antibodies against this antigen. One major problem in expression of full length CD20 is aggregation and misfolding. Therefore,...
[ 7 ] - In vitro Co-Culture of Human Skin Keratinocytes and Fibroblasts on a Biocompatible and Biodegradable Scaffold
Background: Extensive full-thickness burns require replacement of both epidermis and dermis. In designing skin replacements, the goal has been to re-create this model and make a product which has both essential components. Methods: In the present study, we developed procedures for establishing confluent, stratified layers of cultured human keratinocytes on the surface of modified collagen-chito...
[ 8 ] - Evaluation of Growth Inhibitory and Apoptosis Inducing Activity of Human Calprotectin on the Human Gastric Cell Line (AGS)
Background: Calprotectin is cytotoxic agent that its anti-tumor effects are governed through suppression of topoisomerase II a key enzyme in apoptosis. In previous studies, cytotoxicity and apoptotic effects of calprotectin are shown on different cancer cell lines, but not human gastric cancer cell lines. In the present study, cytotoxicity and apoptotic effects of calprotectin on human gastric ...
[ 9 ] - طراحی و ساخت نانو هیدرو ژل‌های سه‌بعدی بر پایه پپتیدهای خود آراینده جهت مهندسی بافت‌های نرم
هیدرو‌ژل‌های تزریقی ازجمله مواد مناسب در مهندسی بافت‌های نرم هستند. امروزه یکی از اهداف بیولوژی سنتزی، طراحی و تولید زیست‌مواد هیدروژل شونده است که ضمن داشتن ویژگی‌های فیزیکی مناسب قادر به خودآرایی درجا در شرایط درون تنی باشند. پپتیدهای دوگانه‌دوست گروهی از این مواد هستند. شبیه‌سازی هرچه بهتر ماتریکس خارج سلولی بافت‌های نرم با هیدرو ژل‌های حاصل از خودآرایی پپتیدهای دوگانه دوست، مستلزم بهینه‌ساز...
[ 10 ] - Transplantation of Cardiogenic Pre-Differentiated Autologous Adipose-Derived Mesenchymal Stem Cells Induced by Mechanical Loading Improves Cardiac Function Following Acute Myocardial Infarction in Rabbit Model
Objective- Investigate myocardial performance after autologous adipose-derived (ASCs) mesenchymal stem cell differentiated under equiaxial cyclic strain, transplantation in rabbits with acute myocardial infarction (AMI). Design- Prospective, randomized experimental study Animals- 20 New Zealand White rabbits (2-3 kg) P...
[ 11 ] - HESA-A Exerts Its Cytoprotective Effects through Scavenging of Free Radicals: An in Vitro Study
Background: Natural medicines have been recently considered more reasonable for human use most notably due to their safety and tolerance. HESA-A is a marine-originated herbal medicine with a variety of healing effects. However, its exact biological mechanism is not clear. The pre-sent study aimed at the evaluation of the HESA-A antioxidant effect. Methods: Chinese hamster ovary (CHO) an...
[ 12 ] - Effect of Micellization pH on Properties of Sphere-like Mesoporous Hydroxyappatite
Mesoporous hydroxyapatites were syntesized by self-assembly method using Cetyltrimethylammonium bromide (CTAB) as cationic surfactant and 1-dodecanethiol as pore expander with pore expander/surfactant mass ratio of 4.22 and synthesis temperature of 80 °C in different micellization pH. The field emission-scanning electron microscopy (FESEM), x-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) ...
[ 13 ] - Fabrication of Silk Scaffold Containing Simvastatin-Loaded Silk Fibroin Nanoparticles for Regenerating Bone Defects
Background: In the present study, a tissue engineered silk fibroin (SF) scaffold containing simvastatin-loaded silk fibroin nanoparticles (SFNPs) were used to stimulate the regeneration of the defected bone. Methods: At first, the porous SF scaffold was prepared using freeze-drying. Then simvastatin-loaded SFNPs were made by dissolvation method and embedded in the SF scaffold. Afterwards, the ...
[ 14 ] - Design and development of CAR-T cells for cancer therapy
Introduction: Today, treatment with CAR-T cells is accepted as an effective treatment for blood malignancies. CAR-T cells are autologous T cells that are engineered by gene transfer techniques to express a chimeric antigen receptor (CAR). Despite the promising results and the approval of six CAR-T cell products; these products have not yet been approved for solid tumors. In addition, the high c...
نویسندگان همکار
Reza Yousefi 21